That faith is of advantage altogether, and that we can do as much as we believe
In Genesis: “And Abraham believed God, and it was counted unto him for righteousness.” Also in Isaiah: “And if you do not believe, neither shall you understand.” Also in the Gospel according to Matthew: “O you of little faith, wherefore did you doubt?” Also in the same place: “If you have faith as a grain of mustard seed, you shall say to this mountain, Pass over from here to that place, and it shall pass over; and nothing shall be impossible unto you.” Also according to Mark: “All things whatsoever you pray and ask for, believe that you shall receive them, and they shall be yours.” Also in the same place: All things are possible to him that believes. In Habakkuk: “But the righteous lives by my faith.” Also in Daniel: “Ananias, Azarias, and Misael, trusting in God, were delivered from the fiery flame.”
Source: The Treatises of Cyprian (New Advent)